Exodus 38:26
a beka a head (a beka is half a shekel, according to the standard used in the sanctuary) for everyone who went through the registration process from 20 years old and older. The total numbered 603,550 bekas.
Numbers 1:46
The total of all those who were numbered was 603,550.
Exodus 12:37
About 600,000 Israeli men traveled from Rameses to Succoth on foot, not counting children.
Exodus 30:13
This is what everyone who is registered is to give: half a shekel according to the shekel of the sanctuary (the shekel weighs 20 gerahs), half a shekel as a contribution to the LORD.
Exodus 30:15-16
The rich person is not to give more, nor is the poor person to give less than the half shekel, when you give a contribution to the LORD to make atonement for yourselves.